Empty Field
Collapse the table of content
Expand the table of content

Guid.Empty Field

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

A read-only instance of the Guid class whose value is guaranteed to be all zeroes.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Shared ReadOnly Empty As Guid

You can compare a GUID with the value of the Guid.Empty field to determine whether a GUID is non-zero. The following example uses the Equality operator to compare two GUID values with Guid.Empty to determine whether they consist exclusively of zeros.


Module Example
   Public Sub Demo(outputBlock As System.Windows.Controls.TextBlock)
      ' Create a GUID and determine whether it consists of all zeros.
      Dim guid1 As Guid = Guid.NewGuid
      outputBlock.Text += guid1.ToString() + vbCrLf
      outputBlock.Text += String.Format("Empty: {0}", guid1 = Guid.Empty) + vbCrLf
      outputBlock.Text += vbCrLf

      ' Create a GUID with all zeros and compare it to Empty.
      Dim bytes(15) As Byte
      Dim guid2 As New Guid(bytes)
      outputBlock.Text += guid2.ToString() + vbCrLf
      outputBlock.Text += String.Format("Empty: {0}", guid2 = Guid.Empty) + vbCrLf
   End Sub
End Module
' The example displays output like the following:
'       11c43ee8-b9d3-4e51-b73f-bd9dda66e29c
'       Empty: False
'       
'       00000000-0000-0000-0000-000000000000
'       Empty: True


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

Show:
© 2017 Microsoft